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# Balancing chemical equations and calculating yield.

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When baking soda (sodium bicarbonate or sodium hydrogen carbonate, NaHCO3) is heated, it releases carbon dioxide gas, which is responsible for the rising of cookies, donuts, and bread. The balanced equation for this process is: 2NaHCO3 ® Na2CO3 + H2O + CO2. Calculate the mass of NaHCO3 required to produce 20.5 g of CO2.

Which of the following equations is balanced?
a. CO2 + 2KOH ® K2CO3 + 2H2O
b. CH4 + 2O2 ® CO2 + 2H2O
c. Be2C + H2O ® 2Be(OH)2 + CH4
d. Cu + 2HNO3 ® Cu(NO3)2 + NO + H2O
Which of the following equations is balanced?
a. 2Mg + O2 ® 2MgO
b. O3 ® 3O2
c. 2H2O2 ® H2O + O2
d. N2 + 3H2 ® 3NH3
The fertilizer ammonium sulfate [(NH4)2SO4] is prepared by the reaction between ammonia (NH3) and sulfuric acid:
2NH3(g) + H2SO4(aq) ® (NH4)2SO4(aq)
How many kilograms of NH3 are needed to produce 1.00 ´ 105 kg of (NH4)2SO4?
a. 1.70 ´ 104 kg
b. 3.22 ´ 103 kg
c. 2.58 ´ 104 kg
d. 7.42 ´ 104 kg
When baking soda (sodium bicarbonate or sodium hydrogen carbonate, NaHCO3) is heated, it releases carbon dioxide gas, which is responsible for the rising of cookies, donuts, and bread. The balanced equation for this process is: 2NaHCO3 ® Na2CO3 + H2O + CO2. Calculate the mass of NaHCO3 required to produce 20.5 g of CO2.
a. 8.38 g
b. 78.3 g
c. 157 g
d. 39.1 g

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The 4 pages solution shows how to solve the three problems dealing with chemical reactions equations and how to obtain the needed results.

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1.
The reaction is imbalanced.
On the LHS we have 4 oxygen atoms, while on the RHS there are 5 oxygen atoms (3 from K2CO3 and 2 from the )
The reaction is balanced. There are one ...

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